[wireman]

From:http://www.fsis.usda.gov/FactSheets/Microwave_Ovens_and_Food_Safety/index.asp#3

Do microwaves cook food from the inside out?

No. Microwaves penetrate the food to a depth of 1 to 1½ inches. In thicker pieces of food, the microwaves don't reach the center. That area would cook by conduction of heat from the outer areas of the food into the middle.

[AndyJackson]

Because micromaves penetrate, and the heat must be conducted out, not in, the interior temperature of a microwave heated object will necessarily be higher than the surface temperature. It is pretty basic physics.

Not, however, that this justifies a lawsuit.

[AppyPappy]

It boils water internally. That’s why hot dogs explode.

[HeadOn]

Well... they can. Microwaves heat water. If the outside is dry and the inside is moist, like hashbrowns, the answer is, Yes. They heat whatever water or moisture is in the food.